Ag + 2HNO3(конц) = AgNO3 + NO2↑ + H2O
AgNO3 + HBr = AgBr + HNO3
AgBr + Na2S2O3 = Na[Ag(S2O3)] + NaBr
Na[Ag(S2O3)] + 2 Na2S2O3 = Na3[Ag(S2O3)2] + +NaBr
Na3[Ag(S2O3)2] + KCN=Na[Ag(CN)2]+K2S2O3
Na[Ag(CN)2] + AgNO3 = 2AgCN + NaNO3
Дано
W(S)=0.4
-----------------
M(SOx)-?
M(S)=32 g/mol
W(S)=Ar(S) * n / M(SOx)
0.4 = 32*1 / (32+x)
X=48 g/mol
n=48 / 16 = 3
==> SO3
ответ SO3